Here's why:
* Natural behavior: In the wild, goldfish live in schools with other goldfish, which provides them with safety in numbers and helps them find food.
* Social interaction: They enjoy interacting with each other, swimming together, and even playing.
* Reduced stress: Being alone can lead to stress and boredom for goldfish, which can affect their health and lifespan.
However, there are some important things to consider when keeping goldfish together:
* Tank size: Make sure your tank is large enough to accommodate all the goldfish comfortably. A good rule of thumb is 10 gallons of water per goldfish.
* Compatibility: Not all goldfish species are compatible with each other. Research which goldfish types can coexist peacefully.
* Aggression: Some goldfish, especially males, can be aggressive towards each other, especially during breeding season.
* Disease: Overcrowding can increase the risk of disease transmission.
If you're unsure about keeping goldfish together, it's always best to consult with a veterinarian or experienced aquarist.